STMicroelectronics STM32L071CZT6TR

Overview

STM32L071CZT6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP48 package, featuring 192 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation from 1.65 V to 3.6 V across –40 °C to +125 °C. It delivers 0.95 DMIPS/MHz performance and supports 78 5V-tolerant I/Os - ideal for battery-powered industrial sensors and portable medical monitors requiring long runtime and robust analog integration.

For engineers reviewing the STM32L071CZT6TR datasheet, STM32L071CZT6TR pinout, STM32L071CZT6TR application, or STM32L071CZT6TR equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled Stop mode (0.86 µA), 5 µs Flash wakeup time, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

This MCU implements a dual-voltage domain architecture with dynamic voltage scaling, enabling three operating ranges (1.65–3.6 V) and five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby). Its interconnect matrix routes peripherals-including four USARTs (two ISO 7816/IrDA-capable), six SPIs (up to 16 Mbit/s), and three I2Cs (two with SMBus/PMBus)-to the Cortex-M0+ core without bus contention.

The embedded power management includes programmable voltage detector (PVD), ultra-low-power BOR with five thresholds, and independent 32 kHz RTC oscillator with calibration. Clock flexibility is provided by multiple internal sources (HSI16 ±1%, MSI 65 kHz–4.2 MHz, LSI 37 kHz) plus external 1–25 MHz HSE and 32 kHz LSE, all feeding a configurable PLL for CPU clock generation.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified, suitable for automated assembly and high-reliability industrial environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L071CZT6TR, STM32L072CZT6 adds security IP without increasing power or size, while STM32L031K6T6 trades memory/peripherals for lower cost and footprint - both retain identical low-power architecture and temperature range.

Availability

STM32L071CZT6TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply over extended product lifecycles.

Supply support for STM32L071CZT6TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, wide temperature operation, and integrated analog peripherals - optimized for energy-constrained IoT endpoints and portable instrumentation.

FAQ

What is the maximum operating frequency and associated power consumption in Run mode?

The STM32L071CZT6TR operates up to 32 MHz with 0.95 DMIPS/MHz performance. At 32 MHz and 3.3 V, typical Run mode current is 93 µA/MHz (≈2.98 mA total), measured with code executing from Flash and peripherals idle. Dynamic voltage scaling allows lower VDD in reduced-frequency modes to further cut power.

Does this MCU support hardware encryption or secure boot features?

No - the STM32L071CZT6TR does not include hardware AES, DES, or SHA accelerators, nor does it support secure boot or tamper-detection circuitry. For cryptographic functionality, consider the pin-compatible STM32L072CZT6, which integrates AES-128 and TRNG while retaining identical power and peripheral specifications.

How many ADC channels are available, and what is the minimum supply voltage for full 12-bit operation?

The device provides up to 16 ADC input channels (via PA0–PA7, PB0–PB1, PC0–PC5, PF4–PF5) with full 12-bit linearity and 1.14 Msps sampling rate. Full specification is guaranteed down to 1.65 V supply; below this, ADC accuracy degrades and conversion rate drops due to internal reference limitations.

Can the internal 32 kHz LSE oscillator be calibrated, and what accuracy is achievable?

Yes - the LSE can be calibrated using the RTC_CALIB register to adjust output frequency in ±488 ppm steps. With factory-trimmed LSE and optional software calibration against a known reference, typical accuracy reaches ±20 ppm over –40 °C to +85 °C, sufficient for metering-grade timekeeping without external TCXO.